题目

—Sorry, I broke your wineglass. —_______You didn’t mean to. A. Never mind. B. Certainly not! C. Why not be careful? D. Don’t mention it. 答案:A已知向量集合M={a|a=(1,2)+λ(3,4),λ∈R},N={a|a=(-2,-2)+λ(4,5),λ∈R},则M∩N=(  )A.{1,1}B.{1,1,-2,-2}C.{(-2,-2)}D.∅
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